THE CATERPILLAR LAB BLOG

Last month, when I wrote a post all about the osmeterium, I asked for suggestions regarding other anatomy you’d like to learn about. One request was for information about “hydraulics of prolegs.” I’ve been reading up on prolegs for weeks...

This week's Caterpillar of the Week, spicebush swallowtail (Papilio troilus), has an extra-special body part that some of you may have observed at our shows. It's a two-pronged structure called an osmeterium, which stays hidden under the caterpillar's skin until the c...